Otter Tail Corp SEC filings OTTR
Otter Tail Corp has 878 filings in SEC EDGAR's recent list, going back to Jul 1, 2009. Its latest annual report, Form ARS, was filed on Mar 2, 2026 for the period ended Dec 31, 2025. The latest quarterly report (Form 10-Q) was filed on Nov 4, 2026, covering the quarter ended Sep 30, 2026. The most recent current report (Form 8-K) was filed on Nov 3, 2026 (results of operations). The company's fiscal year ends on December 31.
| Form | Description | Filed | Period |
|---|---|---|---|
| SD | Specialized disclosure (conflict minerals) | May 29, 2026 | — |
| SD | Specialized disclosure (conflict minerals) | May 30, 2025 | — |
| SD | Specialized disclosure (conflict minerals) | May 24, 2024 | — |
| SD | Specialized disclosure (conflict minerals) | May 25, 2023 | — |
| DEFR14A | Filing | Mar 7, 2023 | — |
| SD | Specialized disclosure (conflict minerals) | May 27, 2022 | — |
| SD | Specialized disclosure (conflict minerals) | May 28, 2021 | — |
| SD | Specialized disclosure (conflict minerals) | May 29, 2020 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2019 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2018 | — |
| CT ORDER | Filing | Jun 9, 2017 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2017 | — |
| SD | Specialized disclosure (conflict minerals) | May 31, 2016 | — |
| POSASR | Filing | Oct 13, 2015 | — |
| CT ORDER | Filing | Sep 18, 2015 | — |
| SD | Specialized disclosure (conflict minerals) | Jun 1, 2015 | — |
| SD | Specialized disclosure (conflict minerals) | Jun 2, 2014 | — |
| UPLOAD | Letter from the SEC | Jan 29, 2014 | — |
| CORRESP | Letter to the SEC | Jan 24, 2014 | — |
| UPLOAD | Letter from the SEC | Jan 14, 2014 | — |
| CORRESP | Letter to the SEC | Dec 26, 2013 | — |
| UPLOAD | Letter from the SEC | Dec 12, 2013 | — |
| CT ORDER | Filing | Oct 7, 2013 | — |
| CT ORDER | Filing | Jun 3, 2013 | — |
| CT ORDER | Filing | Mar 22, 2013 | — |
| 15-12G | Deregistration | Mar 12, 2013 | — |
| UPLOAD | Letter from the SEC | Jan 28, 2013 | — |
| CORRESP | Letter to the SEC | Jan 23, 2013 | — |
| UPLOAD | Letter from the SEC | Dec 31, 2012 | — |
| UPLOAD | Letter from the SEC | Oct 29, 2010 | — |
| CORRESP | Letter to the SEC | Oct 25, 2010 | — |
| UPLOAD | Letter from the SEC | Oct 13, 2010 | — |
| CORRESP | Letter to the SEC | Sep 29, 2010 | — |
| UPLOAD | Letter from the SEC | Sep 16, 2010 | — |
| POSASR | Filing | Jul 1, 2009 | — |
| POSASR | Filing | Jul 1, 2009 | — |
| 8-K12G3 | Form 8-k12g3 | Jul 1, 2009 | Jul 1, 2009 |
Showing 37 filings. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Electric Services (SIC 4911)
- Listed as
- OTTR (Nasdaq)
- Fiscal year ends
- December 31
- Incorporated in
- MN
- Headquarters
- Fergus Falls, MN
- SEC filer status
- Large accelerated filer
- SEC CIK
- 1466593
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.